Note 11 — Chapter IV · VAN

It cannot be expected that we should be able to collect evidence of a satisfactory nature in respect of the changes which would fall within the first category. We have to rely upon the statements and even upon the inferences which may be derived from the writings of travellers. Even if we could rest contented with the accuracy and sufficiency of such testimony in the case of lakes which are so much affected by the melting of the winter snows, it would not establish, except in a very approximate manner, the beginnings and ends of the successive phases. Still, the subject is so interesting that it is worth while to collate the observations of which record may be found. In the subjoined table I have endeavoured to perform this task; and it has already been undertaken with great diligence by Dr. Sieger. It will be seen that a certain correspondence may occasionally be traced in the periodical fluctuations which have affected the three sheets of water.11 Perhaps the most remarkable evidence in this sense is that which is furnished by the almost simultaneous observations for 1898. Messrs. Belck and Lehmann for Lake Gökcheh, Mr. Günther for Lake Urmi, and my companion, Mr. F. Oswald, and myself for Lake Van, all bear witness to a rise in quite recent years. Our own investigations were made during the month of July of that year, and were confined to the westerly inlets of the lake. A prominent feature about these inlets was the tendency of the streams to form shallow lagoons behind a narrow barrier of alluvial sand. On the margin or even in the bed of such lagoons one might often see a group of willows. Some had been immersed a foot or two by the rise in the waters; and, while their neighbours on dry land were green and thriving, these were quite dead. The most notable example was observed by Oswald within the little broken-down crater on the southern shore opposite Akhlat. It receives the lake within its enfolding arms. We have called it Sheikh Ora after a little village of that name which was discovered in its south-east corner. Oswald sailed across to examine this interesting spot while I was busily engaged at Akhlat. Between the village and the water he came across a small grove of willows upon which the lake had gained. Those above the water line were evidently flourishing; but those which stood in the lake had been killed and their bark withered, so that many of the stems were quite gaunt and bare. The average diameter of the trunks of the dead and the living was not appreciably different. It was therefore not a question of an advance of the lake dating back very many years. On the other hand there had been time for the chemical properties of the water to exercise their destructive effect.